Sheet-doubling machine



F. W. HENSKEY SHEET DOUBLING MACHINE Mar. 13, 1923.

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F. W. HENSKEY SHEET DOUBLING MACHINE Filed Aug. 9, 1921 14 sheets-sheet7 INVENTOR ATTORNEYS F. W, HENSKEY SHEET DOBLING MACHINE Mar. 13,1923.1,448,442

Filed Aug. 9, 1921 14 sheets-sheet 8 INVENTOR Mams, 1923. 1,448,442

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' 1,448,442 F. w. HENSKEY SHEET DOUBLING MACHINE Filed Aug. 9, 1921 14sheets-,sheet ll ATTORNEYS @J m @NM Rum 4, n m Q m m e A. H m MF IAal... .W ul. f M @16.0 o MNM .f. Y A NN @KO o SN I m ym m 1, m m 9. H mNo w. m m F. w m wu mim 3. //N N Ma, SQ ww www N mwwwmw @www ATTQRNEYS 41,448,442 F. W. HENSKEY l SHEET DOUBLING MACHINE Filed Aug. 9, 1921 14sheets-sheet l5 Mar. 13, 1923.

F. W. HENSKEY SHEET DOUBLIN'G' MACHINE 14 sheds-sheet 14 Filed Aug. 9,1921 M 6 /166 6 111. P/ 0,. u .FZ M w. 6 6 6 W, 6 7 y y 0A 6 -1- Z, w mw f l I 7 Q 0l Iwo. 6 I 6 0 LW fr l! w J H. .7 d 6 ma! MD .h l 0J/ 6 16-Patented Mar. i3, 1923.

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FREDERICK WILLIAM I-IENSKEY, 0F MCKEESPORT, PENNSYLVANIA, ASSIGNOR `TOi. i

THE SHEET AND TIN PLATE DUBLING :MACHINE COMPANY, OF MCKEESPORT,

PENNSYLVANIA, A CORPORATION 0F DELAWARE.

SHEET-DOUBLING MACHINE.

Application filed August T 0 all i0 zom t mail concern Be it known thatl, FREDERICK V. HENSKEY, a citizen of the United States, residing atMcKeesport,v in the county of Allegheny and State of Pennsylvania, haveinvented a new and Improved Sheet-Doubling Machine, of which thefollowing is a specification.

My invention which, in general, relates to that class of machinerydesigned for doubling or folding sheets, has special reference, however,to machines for doubling sheets or packs of tin plate or other metal.

-lVhen the rolls of the mill are working properly, the sheets come fromthe rolls with one of their ends squarev across and the other concaved,while when the rolls are. working full, the pack comesI out with thescrap end conveXed. y y

ln bending the sheet-s, it is lthe object to so fold the same as toleave as litt-le scrap or waste, to cut olf, as possible.v y 4Heretofore in folding tin plate, the overall length of the platedetermined the bending place (curled end as it is called after bending)therefore requiring that a cut be taken which will not only shear offthe scrap end but also so much of the square end as lies on top of thescrap end.

It is therefore one of the objects of my invention to provide means forso positioning the pack on the folding tablethat the place of fold orbend will be so located that the square end, when folded over on thescrap end, will come to such position that it will lie tangent te thecurve of the concaved scrap end or along the chord of the arc of theconveXed scrap end accordingly as the plate is one which came fromproperly working or full workingrolls, thereby making it necessary toshear off only the scrap ends and reducing the wastage to the minimum.4

Another object of my invention is so to handle the pack that it comesonto the table from the rolls in a direction at right angles to that atwhich it passes to the shears and at which it leaves the machine to passto the heater.

The invention further has 'for its objects to provide a machine in whichthe turntable moves in one direction only, stopping automatically in itscourse at the threequarter and full revolution station, the table 9,1921. Serial No. 490,988.

being set in motion means under control y f of the attendant; to providemeans for edging and gripping' the pack so that it will remain on onecertain bendingplate during the bending operation and until the bendingplates are restored to theirA when the pack is enable it to be fed tothe shears;l to provide automatically actuated means for releasing orunlockingthe grippers at proper intervals to release the pack; toprovide automatically normal position,

actuated breakers that' hold the pack down Figure 1 is atopplan view oftheinvenl tion with a tin pack` in place `centered by the centeringgauge and gripped by the gripping mechanism. Y

Figure 2 is a top plan view showing the table turned one-quarterrevolution.

Figure 8 is a top plan view showing the table turned one-halfrevolution.

Figure 4 is ay top plan View showing they table turned to, andautomatically stopped at, the three-quarters revolution.

automatically released topreferred embodiment. of my `in-v Figure 5 is atop plan view showing the table in like position, the tin pack havingbeen trimmed of waste and being removedU from the table by the ing inreverse direction.

lFigure 6 is a vertical cross section taken" substantially on the line 66 on F iOiure 3.`

Figure 7 is a vertical longitudinal section of a portion Lof the machineand which is taken substantially on the line 7--7 `on Figure 5, partsbeing shownin elevation.

Figure 8 is a vertical cross section taken on the line 8 8 on Figure 5.Figure 9 is a horizontal sectional 'view passing rollers, rotattakenthrough the lower part of the masonry base and clearly illustrates thepower and driving mechanism. Figure 10' is a detail plan'view of therotatable table, the cover plate and the bending plates being removedand other parts being in section for the purpose ot' more clearlyillustrating the parts shown.

Figure 11 is a detail plan view ol the bending plates per se.

Figure 12 is a detail cross section thereof on the line 12-12, on lfig.11, the rest ber for said plat-es being also shown.

Figure 13 is a detail cross section taken on the line 13-13 on Figure11.

Figure 14 is a detail plan view of the tin pack centering mechanism perse, parts being broken away.

Figure 15 is a detail perspective view ot' the operating crank "lor thesaid centering mechanism.

Figures 15 and 17 are detail perspective views or the centering arms olthe centering mechanism.

Figure 18 is a detail perspective vievv ot the main casting per se.

Figure 19 is a similar view of one ot the pivoted yoke levers whicheffect the raising and lowering of the breaker members.

Figure 20 is a diagrammatical development of one of the cam tracks whichregulate the raising and lowering of the said breaker members.

Figure 21 lis a somewhat diagrammatic cross section of the mach-ine andillustrates the passing rollers driving mechanism, parts being omittedfor the purpose ol more clearly illustrating; the parts shown.

Figures 22 and 28 are detail views illustrating single sheets of tin,one from properly Working rolls and one from full Working rolls, andillustrating the manner in which the fold and cut isI made on each insuch manner as to minimize the Waste.

ln the embodiment ol' my invention shown in the accompanying drawings,in which drawings like numerals of reference indicate like parts in allof the figures, 1 represents the top platform which is supported onchannel irons 2 flush with the ground level. The channel irons 2 aresustained by standards 8 mounted on the ledge 4 ot the masonry pit 5.The pit has its bottom G provided With a central eleva-tion 7 in whichat 21 is anchored the stub shalt or post 20.

The platform, 1, which is laid flush with the floor level, has acircular opening 8 for the turn-table 10, the top of which liies l'lushwith the platform and is carried on a frame composed of a ring` 11 thatis braced by channel irons 12 and 18, and a casting 18 Whose arms 14 aresecured to the ring l1 and which has a bearing around the post 20.

The Weight of the turn-table frame and the parts carried thereby issustained by brackets 15 With flanged Wheels 16 that ride on a circulartrack 9 on the top of the Wall 5 of the pit.

The turn-table is provided With a rectangular opening :tor the foldingplates 27 and 28 and the feed rollers- 65, as best shown in Figure rllhechannel irons 12 and 18 also support the centrally located bearing edgebar or rest 17 for the adjacent ends of the folding plates 27 and 28.

The ring 11 has an externa-l gear 19 by means of which the table isturned through the action or' mechanism later' described.

Loose on the post 2O is a spur gear 22, while a bevelled gear 23 isJfastened immovably to the post, as at 24, and it is between these gears22 and 28 that the casting 18 has The casting 13 also supports tivo setsoll vertical guides 25 on its extensions 26, in which guides the slides51 and 54, hereinafter again referred to, operate.

There are two foldingr plates 27 and 28 provided7 each separate from theother but cooperating book fashion to fold together and thereby fold orbend over the sheet or sheets of the material being Worked on betiveenthem.

These plates have cut out portions 29 in which the feed rollers 65 liewhen the plates are lying` Hat in their inoperative position.

The plates, when lying flat7 are sustained by having their lugs 50arranged to rest on supports of the table frame to keep the center ofthe plates Jfrom rising when the break# ers are released.

The plates 27 and 28 also have central bearing lugs 30 and side lugs 31,the latter depending from the plates proper lor a purpose laterunderstood.

rThe plate 27 has T-slots 32 for the stops which are adjustably held inplace by clamps 84. The opposite plate 28 has correspondingly locatedrecesses lto receive the` stops 83, when the plates 27 and 28 are toldedtogether.

The plate 28 also has B`slots 82 for the adjustable stops 33, and theplate 27 has recesses to receive the stops 83 of the plate 28, when theplates are folded together.

rlhe plate 27 is also provided with T-slots 36 for the lingers 37 of thegripping slide plate 88, each of which has a series of holes 48 for thepack engaging lugs or pins 39, by means of which different Width stockcan be clamped to the table.

40 designates a locking slide bar mounted in guides 48 and having cams41 to engage abutments 42 on the finger plate 38, it also having ashoulder' 44 to receive blows from a Sledge or hammer to force thelocking slide home.

rlhere is a releasing abutment 45 provided which engages a cam 144 onthe platform, as the table rota-tes7 to release or unlock the packgripper slide plate 38 at the proper time and place. 49 is a butt pieceto hold the locking bar 40 against the plate 27.

lrun, in channeled cam tracks 62.

The bending or folding plate 28 has recesses 47 and 48 for the parts 39,41, 42, 43, 49, etc., when the plates 27 and 28 are folded together.

The wings 31 of the bending plates are connected with the slide blocks51 by lrods 52, the slide blocks 51 being raised, to elevate the foldingplates, by the upward movement of the slide 54, the latter `being workedby pitmen 55 connected to cranks on the back of the travelling bevelledgears 53, the latter meshing with the fixed gear 23.

The gears 53 are carried on a shaft 56 which is mounted in suitableprojections of the casting 13.

The breakers 57 are kpivoted between ears 58 and are operated by meansof yoke levers '59 fulcrumed to the casting 13 at 60 and connected withthe breakers by rods 63, the yoke levers 59 have rollers 61 which Therods 63 project through slotted channel iron braces 64, as shown.

The feed rollers shafts 66 and the countershafts 67 are mounted inrelatively fixed locations on the table and do not go up with thefolding plates. The feed rollers are driven from the countershafts 67 bybeveledy gears 68. Bearing brackets 69 are provided for thecountershafts 67.

The countershafts 67 are driven from vertical shafts 70, mounted inbearings 71 in the casting 13, through beveled zgears 72, they being inturn' driven through gears 7 3 meshing with the loose gear 22 and drivenby a vertical shaft 74 and gears 75 and 76 from the drive shaft77.

Power to operate the several lparts of the mechanism may be derived froman electric motor 78 mounted at the ground level and having its powertransmitted through a belt 79 and pulley 80 to a shaft 81 on which is' agear 82 that meshes with a clutch faced gear 83 running loose on theshaft 84.v The shaft 84 has a sliding clutchbrake 85 adapted to engagethe clutch face of the gear 83 or to have its brake surface 86 broughtinto contact with the brake surface 87 fixed to a bearing bracket 88, asthe case may be. The clutch-brake 85 is moved by a frame 93, pivoted at94 and connected at 97 to one link 96 which is pivoted at 98 to anotherlink 96 that is pivoted at a fixed place 99. l l

'A rod 100 slides in a bearing 95 and has `a shouldered head pivoted at98 to the links 96 and has a spring 101 for forcing the links towardlongitudinal alignment to thereby release the clutch-brake 85 from theclutchgear 83 and apply the brake at 86-87. A lever 102 -is provided tomove the links 96 against the force of the spring 101 and the platform 1is notched at 103 to hold the lever 102 with the clutch-brake '85engagturn-table.

The shaft 84 has'a worm 89 whichmeshes with a worm gear 90 on theverticalshaft 91" whose gear 92` meshes with the'ring gear 19. j Y

The shaft 81ha's a pinion 105 which meshes with a gear 107v onafcountershaft 106 that has a vpinion 108 to mesh'with'a gear 109 on ashaft 110 which in 'turn carries a pinion 111 which meshes with a pinion112 on the shaft 113 that is provided with a' loose gear-clutch member114 and a sliding clutch 115. The' clutch 115 is of the wellv knownsingle-revolution-release type, i. e. [it automatically ythrowsout'after making one revolution, and as the construction thereof per seforms no part of my inventioma detailed description yand disclosurethereof is unnecessary. f

The clutch -115 is thrown in by a lever mechanism 116. *n

The shaft 113 'is provided with eccentrics 117 which through their rodswork guillotine knives 118 of the cutting or trimming mechanism. Rollers119 arev provided for the arcuate wings 31 ofthe folding plates whichbear against them in raising and lowering and thereby serve toconstitute lateral bearings therefor when in the opera-y tion of foldingthe tin pack. i ,4

In order to 'center'the sheet orv pack on the table in proper positionto be folded as to facilitate cutting .only a minimum wastage, I providea centering gauge'consisting of a'housing 120 adapted to be clampedremovably onto the platform (preferably flush with the-same) which`encases racks 121 having arms 122 that carry liny gers 124 and 125`an'd*have rollers 123 toA ride on the top of the platform'.` j

`The vfinger 124 rests in contact with the platform, while the linger125 is elevated enough so that `the sheets or packs will pass underthesame. The housing 120 is clamped in place by suitable clamps `129.126 is a pinion in the housing that meshes with the racks 121 and isadapted tok be turned by a removable crank 127. Slots 128 in the housingallow the posts 130that sustain the arms on the racks to pass through. j

The shaft 477 which operates ythe feed rollers is `provided with a wo-rmlgear'131 that meshes with a worm 132 on'a shaft 133 that is journaledinvbearings 134 and is connected through universal joints 1357and lineshaft 136 with) theshaft l137-,that is mounted in bearings142 that arepivoted at 143.' so .that the shaft 137 may be swung bodily laterally.VSlidable on-'but turning with the shaft 137 is a friction gear 138 thatis adapted to cooperate with the fric` tion surface 139 on the pulley80, The' friction gear 138 isf slid along the shaft 137 and` moved intoand outof contact. with the friction face 139'by a lever 140 which ismounted on a universal pivot 141. By moving. the lever 140 to bri-ng thefriction gear 138l to one side or the other of the axis of the shaft 81and moving it into contact with the friction surface 13,9, rotation maylbe imparted to the feed rollers in one direc tionor the other and atsuch speeds as depend upon the distance between the axis of the disc 139and the friction gear 138.

Operation.

So far as described the manner in which my machine operates is asfollows:

Assume the table to be in the posit-ion indicated in Figure 1f, the tinpack having arrived from the mill and entered upon the table from aposition at the top of Figure 1, as indicatedv by thel arrow, the tinplate pack being fed against the arm 124 of the centering gauge by thefeed rollers .controlled through the action of. lever .140, theoperator, after inserting the crank 127:, turns the same until" thefinger 125l lies over the scrap end of the pack just clear of the scrap(i. e. along a line tangent to the concavity, when the scrap end isconcaved, oralong. the chord of the arc of the convexed end'VA of thepack when the scrap end is full. see-Figure 1) thereby bringing, thecenter of the pack at the bending line of the tableg as well as endwiselining. up the plates of the pack.

The attendantr then moves slide 40 to the locking position, hitting theshoulder 44 with a hammer toyk lock the studs 39 against the sheet packand thereby forcing it against the fixed stops 33` and clamping itfirmly in place on the fold-ing or bending plate 27. rlihus the. pack ofsheets is edged and the sheets held in perfect alignment with nopossible chance of spreading. theV sheets or pack7 an important matterin the `man-ufacture of tin plate. The sheets arelocked tothe plateA 27during thecomplete doublingI operation.y l p r The attendant next moveslever 102 toengage notch 1.03. in the platform and there by'V bringsclutchm35 into connection with the ,clutch-gear 83. This sets. shaft84V- in motion to turn the table. As the table turns, through about thefirst' quarter revolution, the breakers 57 will be brought down fromtheir substantially elevated position,y aty which they stood when thetable started tomove, and into alignment across the pack and pressfirmly against it at the line of bend. This is done` by the quickactingportions of the track cams 62 pressing down Ayoke levers 59.'Atthisl time, the table will have assumed the position-shown in Figure2 and-the crankgears 53 will have caused the connecting rods or pitmen'`55 to have brought the slides 54 up into contact with the slide 5.1.

Continued rotation of the table causes the slides 54 to lift the slides51,. thereby elevating the bending plates "27 and 28 to the verticalposition bythe time thevtable has tion when they start'down again togrip they next pack as. the next revolution of the table begins in themanner above described.

Un turning from the half revolution position towardthe three-quartersrevolution position (it being` understood thatftlie tablev movescontinuously from the sta-rt tothe three-quarter position) the bendingvplates are opened and restored flush with the table top. .lust beforethis is done, i. e. just before the completion of the threeequarter turnof the table, the fixed cam 144 is engaged by the roller-abutment 45 andthe locking b ar 40 is released to free the grippers from the pack andleave the pack free for further manipulation.

Asthe table approaches the three-quarters turn position, thel firstv oneof the cams 104 on the table will engagey lever 102 and release it.thereby allowing spring 101 to act and throw out clutch V85 and applythe brakes Sti-87 to stop the turn-table.

The pack is now ready to be fed to the shears and this is accomplished'bythe oper# ator throwing friction gear 138` into propery positionagainst friction disk139- to set the feed rollersv into motion. As theshears are located at they three-quarter station, the folded pack willbe in such position as to present the scrap end to the shears withoutfurther turning ofv the pack. After posi.- tioning the pack to theshears,:the attendant manipulates lever 116 to throw'in clutch 115 whichmakes one revolution, thereby lower-y ing the guillotine knife 118 tocut olf the scrap andI again raising it. The attendant then reverses theoperation of the feed rollers andruns the pack off the table curled endtoward the heater. After this,v theclutch 85 is again thrown in bypushing thel lever 102 forward into the notch 103 and the tablecompletes its revolution, being brought to a stop at the end of the saidrevolution by the releasing of the lever 102 through engagement of it bythe second fixed cam-1047 thusl completing one cycle of operation.

From the foregoing,it willi be seen that I have provided a machine whichis substantially automaticlin action; one Which will handle the sheetsin the most advantageous manner; one in which provision is made forcentering the same amount of good iron on each bending plate leavingonly the scrap at one end projecting` to be trimmed off; one in whichthe location of the doubled pack Will always be on the same ben dingplate with the scrap end presented to the shears and the curled endtoward the heater (i. e. Will discharge in the direction of thehorizontal arrow in Figure 5) one in Which the .table is stoppedautomatically, hence always at the propel' place; one in which handlingof the pack at any time from .the time it enters the machine until itleaves the same ready for the heater, is avoided: and one in which thebreakers are operated by sure and powerful means, their being nopossible dangei` of the breakers becoming wedged between the foldingplates because their operation is controlled by the revolving table,therefore the breakers recede with the same speed as the `bending platesclose.

l/Vhile I have shown a preferred embodiment of the invention in theaccompanying drawings, nevertheless I desire it understood that I do notlimit myself thereto but changes in the details of construction andarrangement of the parts may be made without departing from the spiritof the inventionV or the scope of the appended claims. t

4What I claim is:

l. In a machine of the class described, a rotating table, means forturning the same, means for conveying tin sheets across the table, sheetbending plates carried by the table, means for edging and clamping thesheets on one of the bending plates, breakers for holding the sheet-sdown along the line of bend, means for operating the breakers,

ieans for operating the sheet bending plates and means for releasingsaid edging and clamping means from the sheets after they have beendoubled.

2. In a machine of the character described, a rotating Stable, means forturning the same, means for travelling the sheets to be folded acrossthe table, means for positioning the sheets on the table, sheet foldingplates carried by the table, means for edging and clamping the sheets toone of said plates, means operating on the commencement of rotation ofthe table for applying said edging and clamping means, breakers forholding the sheets down along the line of bend, means operating onfurther rotation of the table for applying said breakers to the sheets,means operating on still further rotation of the table for doubling thesheets,` means for withdrawing' said breakers from 4the sheets beforethey are completely doubled, and means for releasing said edging andclamping means from the sheets after the sheets are doubled.

3. A rotating table, sheety conveying means for placing. sheets on andremoving them from said table, folding vplates carried by said table fordoubling the'sheets, 70 clamps holding' the sheets in placeH on thefolding plates, breakers for holding the sheets down at the line ofybend as said folding plates begin their folding act, and means foroperating the aforesaid parts in orderly fashion during each rotation ofthe table. v

4:. In apparatus ofthe class described, a rotating table, sheetconveyors for delivering the sheets onto and removing them from so saidtable, sheet folding plates carried by said table, means for .holdingthe sheets in place on said folding plates, breakers for holding` thesheets down at the line ofy bend, means governed by the rotation of thetable for operating said` sheet folding plates and said breakers, andmeans for effecting rotation ofthe table.l

In a}' paratus of theclass described, a. rotating table, sheet conveyorsfor delivering the 'sheets onto and yremoving them from said table,sheet folding plates carried by said table, means-for holding the sheetsin place on said foldingplates, b'reals, ers for holding the sheets downat-the line of bend, means governedby kthe rotation of the table foroperating said sheet :folding plates and said breakers, means foreffecting rotation of the table, said sheet folding ,j means includingedging' clamps, and means 100 governed by the rotation of vthe table forreleasing said edging clamps after the sheets have been folded. Y

6. In a machineof, the class described, a rotating table, vmeans forimpartingunidirectional rotation to said table, sheet feeding means,manually controlled. power applying devices for operating said sheetfeeding means, sheet Aclamping means` sheet folding ,f means'includinghinged fold-ing plates and 110 breakers, means governed by the yrotationof said table for operating said folding plates and breakers, meansgoverned. by the `rotation of the table for releasing said sheetclamping means after the sheet has been folded. 'f

7. In a machine of theclass described, a rotatable table, powerapplying' mechanism for imparting rotation thereto, sheet fold- 'ers andclamps onthe table, and'means 120 operating during each rotation of thetable for actuating said folders and releasing said Clampsy Y. -i A '8.'In a ma'chi e' ofthe class described, a.- rota'table ta'ble, powerAapplying-[mechanism 125 for imparting rotation toi-said table, amanually controlled means for startingro- .tation ofy the itable; andmeansvco-,operative therewith and governed by the rotation Vof the tablefor stopping the rotation of the Atable at intervals, sheet foldingplates and breakers carried by the table andl means for operating saidfolding plates vand breakers governed'by the rotation ofthe table.

9. In a machine of the class described, a

'rotating table, means for effecting rotation `of the same, sheetfeeding rollers on the table, sheet centering elements, sheet slideclamps, means for locling and unlocking said slide clamps, sheetbreakers, means -for lowering and raising said breakers at intervals,,said means being y.governed by the rotation of the table, .sheetbending plates, `and means `governed ,by the rotation of Athe table foractuating said bending plates at intervals.

10. Ina machine of the class described, a rotating table, means foreffecting rotation kof the same, Asheet feeding rollers on the table,sheet centering elements, sheet slide clamps, means for locking andunlocking said slide clamps, Ksheet breakers. means for lowering andrraising said 'breakers at intervals, said means being governed by therotation of the table, sheet `bending plates, means governed ,by therotation of the table for actuating said bending plates at intervals,shears adjacent to the table to which the packis fed yby said feedingrollers, and means to operate lsaid shears.

11. In a machine of the .class described, a rotating ta'ble, means torotate said table, means for stopping the rotation of said table afterit has progressed three-quarters of a revolution and again at the end ofa full revolution, means for startingthe rota.- tions of the table,sheet feeding elements on the table, sheet centering, sheet edging andsheet clamping means on vthe table, manual controls for said feeding,centering edging and clamping means, and mechanically actuated meansoperated at the end of the three-quarter turn of the table to releasesaid edgingand clamping` means, and means for folding the sheets duringthe first lthreequarter turn of the table.

12. In a machne of lthe class described, a rotating table, means torotate said table, means for stopping the rotation of said table ,afterit has progressed three-quarters of a revolution and again at the end ofa full revolution, means for starting the rotations of the table, sheetfeeding elements on the table, lsheet centering, sheet edging and sheetclamping means on the table, manual lcontrols for said feeding,center-ing, edging and `clamping means, and mechanical-'ly actuated'mean-s operated at the` end of the three-quarters -tulr-n o-f the tableto releasesaid edging and clamping means, means for fold-ing the sheetsduring the rst three- 'q'uarterturn of the table, and means opera- 'bythe rotation ofthe table and located in the pit for operating saidbreakers and sheet bending plates.

14;. In a machine of the class described, the combination with a fixedplatform a rotatable. table having bending plates on which the ysheetsare received, of a sheet centering device mounted on said platform andco-operating with said table for locating the place of bend of thesheets at the bending line between the bending plates.

15. In a machine 0f the .class described,

the combination With a rotatable table having ,bending plates `on whichthe sheets are received, of a sheet centering device for locating theplace of :bend of the sheets at the bending line between the bendingplates, and sheet edging and clamping members on the bending plates forholding .the centered sheets.

'16. In a machine of the class described, the combination with a table,of a .sheet centering device. comprising a pair of `.parallel lingers,one 'in close proximity to the plane of the table top andthe otherelevated above the same, means to locate `said fingers equidistant fromand at opposite sides of the centerline of the table, means to causesaid fingers to approach or recede from one another with equa-lvelocit-y to thereby center the sheet.

17. In combination with the platform and the table top, a sheetcentering device located on the table top including Ka. housing, rackbars and a pinion cooperating therewith in the housing, arms connectedto said bars, rollers sustaining said arms on the platform, fingerscarried by said arms to project over the table top and a crank forturning said pinion.

18. In lcombination with the platform and the table top, a sheetcentering device located on the table top includ-ing a Vhousing, rackbars and a pinion cooperating therewith in the housing, arms connected-to lsaid bars, rollers sustaining said arms on the platform, fingerscarried by s aid arms to project over the .table top a-nd a erari'lr forturning said pinion, one of said fingers 'lying close to the table topto raise a sheet thereon, the other of s a-id fingers being elevatedabove the sheets for the purposes specified.

19.*1na machine orf-the class described,

